I'm sure there are patents that prevent them from doing this, but I would have loved if Apex released a MOAI-type device (although, preferably smaller) that's a robotic glass cleaner and doubles as an in-tank web cam. How nice would it be to schedule glass cleanings and have it automatically pump HD video of the inside of your tank directly to the Fusion tile.
I'm also onboard with the frozen feeder and customization of switch labels on Fusion. Most importantly, I think they need to put some time into adding additional drop-down options, tasks, wizards, and conditional statements into the Fusion interface. For example, a few of the things listed by others are possible right now, but you have to write code (or really, pseudo-code) to accomplish it. For someone that's used to writing scripts to automate tasks, this is second nature because some of us do this for a living. For others, it may not be as straight-forward. Keep in mind, these additions to Fusion are very easy to implement for them, so I'd really like to see them focus on that, so all Apex users get the most out of their controller.